CN110518983B - Reconfigurable filter based on dual-polarization dual-parallel Mach-Zehnder modulator - Google Patents
Reconfigurable filter based on dual-polarization dual-parallel Mach-Zehnder modulator Download PDFInfo
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Abstract
A reconfigurable filter based on a dual-polarization dual-parallel Mach-Zehnder modulator and application thereof are disclosed, wherein the reconfigurable filter comprises: a narrow linewidth laser for providing a light source; the first polarization controller is connected with the output end of the narrow linewidth laser; a dual-polarization dual-parallel Mach-Zehnder modulator connected with the output end of the first polarization controller for performing electro-optical modulation on the optical signal; a microwave source unit; a direct current source connected to the dual-polarization dual-parallel Mach-Zehnder modulator; a Brillouin scattering unit; and a photodetector. The invention can realize the narrow-band filter with a single light source structure, can realize the switching between the single-pass filter and the double-pass filter only by adjusting the direct current bias point of the modulator, and has adjustable central wavelength, simple structure and low cost.
Description
Technical Field
The invention belongs to the field of microwave photonics, and particularly relates to a reconfigurable filter based on a dual-polarization dual-parallel Mach-Zehnder modulator.
Background
With the wide spread of communication frequencies, high frequency communication systems present a significant challenge to electrical technology. The microwave photon technology effectively solves the problems of frequency limitation on electricity, serious electromagnetic interference and the like. The filter is one of the core devices of a communication system, the microwave photon filtering technology is an effective radio frequency signal processing method for directly modulating broadband radio frequency signals onto optical carriers to realize microwave filtering in an optical fiber system, can overcome the limitation of electronic bottlenecks on sampling rate (reaching more than 100 GHz), and has the advantages of low loss, no change of loss along with frequency, electromagnetic interference resistance and the like. In recent years, microwave photonic filters have been rapidly developed, and among them, microwave photonic filters based on brillouin scattering have received much attention. The traditional Brillouin scattering filter can only realize a single pass band or can only realize a double pass band, and two lasers are generally needed. This is not only expensive for the whole system, but also limits the range of applications.
Disclosure of Invention
In view of the above, it is a primary object of the present invention to provide a reconfigurable filter based on dual-polarization dual-parallel mach-zehnder modulators and applications thereof, which are intended to at least partially solve at least one of the above technical problems.
In order to achieve the above object, as one aspect of the present invention, there is provided a reconfigurable filter based on a dual-polarization dual-parallel mach-zehnder modulator, including:
a narrow linewidth laser for providing a light source;
the first polarization controller is connected with the output end of the narrow linewidth laser and is used for carrying out polarization control on an optical signal output by the narrow linewidth laser so that the polarization direction of the optical signal is aligned to one main shaft direction of the dual-polarization dual-parallel Mach-Zehnder modulator;
a dual-polarization dual-parallel Mach-Zehnder modulator connected with the output end of the first polarization controller for performing electro-optical modulation on the optical signal;
the microwave source unit is connected with the dual-polarization dual-parallel Mach-Zehnder modulator and used for providing microwave signals for the dual-polarization dual-parallel Mach-Zehnder modulator;
a direct current source connected with the dual-polarization dual-parallel Mach-Zehnder modulator for performing bias control on the dual-polarization dual-parallel Mach-Zehnder modulator;
the Brillouin scattering unit is used for realizing opposite transmission of two paths of optical signals modulated by the dual-polarization dual-parallel Mach-Zehnder modulator in a single-mode optical fiber of the Brillouin scattering unit so as to stimulate Brillouin scattering; and
and the photoelectric detector is connected with the Brillouin scattering unit and is used for performing photoelectric conversion on the optical signal subjected to Brillouin scattering so as to realize the function of the reconfigurable filter.
As another aspect of the present invention, there is also provided an application of the reconfigurable filter as described above in the field of microwave communication.
Based on the technical scheme, the reconfigurable filter based on the dual-polarization dual-parallel Mach-Zehnder modulator and the application thereof have at least one of the following advantages compared with the prior art:
the invention can realize the narrow-band filter with a single light source structure, can realize the switching between the single-pass filter and the double-pass filter only by adjusting the direct current bias point of the modulator, and has adjustable central wavelength, simple structure and low cost.
Drawings
For a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description of the preferred embodiments thereof, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic structural diagram of a reconfigurable filter based on dual-polarization dual-parallel Mach-Zehnder modulators according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the internal structure of a dual-polarization dual-parallel Mach-Zehnder modulator according to an embodiment of the present invention;
fig. 3 is a schematic diagram of the internal structure of the first and second optical circulators.
In the above figures, the reference numerals have the following meanings:
1. a narrow linewidth laser; 2. a first polarization controller; 3. a dual-polarization dual-parallel Mach-Zehnder modulator; 4. a vibration beam splitter; 5. a second polarization controller; 6. an optical power amplifier; 7. a second optical circulator; 8. a single mode optical fiber; 9. a first optical circulator; 10. a photodetector; 11. a direct current source; 12. a first microwave source; 13. a second microwave source; 14. a first power splitter; 15. a second power splitter; 3-1, port 3-1; 3-2, port 3-2; 3-3, port 3-3; 3-4, port 3-4; 3-5 and 3-5 ports; 3-6 and ports 3-6; 3-7, and ports 3-7; 3-8 and 3-8 ports; 3-9, port 3-9; 3-10 and 3-10 ports; 3-11, ports 3-11; 3-12, ports 3-12; 4-1, port 4-1; 4-2, port 4-2; 4-3, port 4-3; 7-1, port 7-1; 7-2, port 7-2; 7-3, port 7-3; 7-4 and a port 7-4; 7-5 and a port 7-5; 7-6 and port 7-6; 8-1, port 8-1; 8-2, port 8-2; 9-1, port 9-1; 9-2, port 9-2; 9-3, port 9-3; 9-4, port 9-4; 9-5, port 9-5; 9-6, port 9-6; 14-1, port 14-1; 14-2, port 14-2; 14-3, port 14-3; 15-1, port 15-1; 15-2, port 15-2; 15-3, port 15-3.
Detailed Description
In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.
The invention mainly aims to provide a reconfigurable filter based on a dual-polarization dual-parallel Mach-Zehnder modulator, aiming at the problems that the conventional filter based on Brillouin scattering has fixed passband number and complex system. The direct current bias point of the dual-polarization dual-parallel Mach-Zehnder modulator is adjusted, the quantity of the pumping light is changed, single or double Brillouin scattering is excited, and switching between the single-passband filter and the dual-passband filter is achieved. Meanwhile, the system only needs one laser source, and is simpler in structure and lower in cost.
The invention discloses a reconfigurable filter based on a dual-polarization dual-parallel Mach-Zehnder modulator, which comprises:
a narrow linewidth laser for providing a light source;
the first polarization controller is connected with the output end of the narrow linewidth laser and is used for carrying out polarization control on an optical signal output by the narrow linewidth laser so that the polarization direction of the optical signal is aligned to one main shaft direction of the dual-polarization dual-parallel Mach-Zehnder modulator;
a dual-polarization dual-parallel Mach-Zehnder modulator connected with the output end of the first polarization controller for performing electro-optical modulation on the optical signal;
the microwave source unit is connected with the dual-polarization dual-parallel Mach-Zehnder modulator and used for providing microwave signals for the dual-polarization dual-parallel Mach-Zehnder modulator;
a direct current source connected with the dual-polarization dual-parallel Mach-Zehnder modulator for performing bias control on the dual-polarization dual-parallel Mach-Zehnder modulator;
the Brillouin scattering unit is used for realizing opposite transmission of two paths of optical signals modulated by the dual-polarization dual-parallel Mach-Zehnder modulator in a single-mode optical fiber of the Brillouin scattering unit so as to stimulate Brillouin scattering; and
and the photoelectric detector is connected with the Brillouin scattering unit and is used for performing photoelectric conversion on the optical signal subjected to Brillouin scattering so as to realize the function of the reconfigurable filter.
Wherein the wavelength of the light source is 1530-1610 nm, such as 1550 nm; the linewidth is less than or equal to 100 kHz.
The connecting optical fiber between the dual-polarization dual-parallel Mach-Zehnder modulator and the polarization beam splitter is a polarization-maintaining optical fiber;
the dual-polarization dual-parallel Mach-Zehnder modulator comprises two dual-parallel Mach-Zehnder modulators which are placed in parallel, and the two dual-parallel Mach-Zehnder modulators work in two mutually perpendicular polarization directions respectively;
the dual-polarization dual-parallel Mach-Zehnder modulator is made of lithium niobate crystals;
the dual-polarization dual-parallel Mach-Zehnder modulator is an electro-optical modulator;
the working wavelength of the dual-polarization dual-parallel Mach-Zehnder modulator is 1530-1610 nm, the bandwidth for processing microwave signals is larger than or equal to 20GHz, the extinction ratio is larger than or equal to 20dB, and the half-wave voltage is larger than or equal to 4V.
Wherein, the working frequency range of the photoelectric detector is more than 40 GHz.
Wherein the microwave source unit includes:
a first microwave source for simulating an input microwave signal;
the input end of the first power beam splitter is connected with the first microwave source, and the output end of the first power beam splitter is connected with the double parallel Mach-Zehnder modulator and used for splitting the first microwave source;
a second microwave source for providing pump light required to excite brillouin scattering; and
and the input end of the second power beam splitter is connected with the second microwave source, and the output end of the second power beam splitter is connected with the double parallel Mach-Zehnder modulator and is used for splitting the beam of the first microwave source.
The working bandwidth of the first microwave source is more than 40GHz, and the output power is less than 22 dBm;
the working bandwidth of the second microwave source is more than 40GHz, and the output power is less than 22 dBm;
wherein the splitting ratio of the first power splitter is 50:50, the two paths of beam splitting signals have no phase difference, and the working bandwidth is more than or equal to 40 GHz;
wherein the splitting ratio of the second power splitter is 50:50, the two paths of beam splitting signals have no phase difference, and the working bandwidth is more than or equal to 40 GHz;
the bandwidth of the optical power amplifier is larger than the working bandwidth of the dual-polarization dual-parallel Mach-Zehnder modulator;
the I modulator in the dual-polarization dual-parallel Mach-Zehnder modulator is modulated by two paths of beam splitting signals of the first microwave source;
and the two paths of beam splitting signals of the second microwave source modulate a Q modulator in the dual-polarization dual-parallel Mach-Zehnder modulator.
Wherein the Brillouin scattering unit includes:
the polarization beam splitter is used for splitting two paths of optical signals with different polarization directions modulated by the dual-polarization dual-parallel Mach-Zehnder modulator into a first path of optical signal and a second path of optical signal;
the second polarization controller is used for converting the polarization direction of the first path of optical signal into the polarization direction which is the same as that of the second path of optical signal;
the input end of the optical power amplifier is connected with the output end of the second polarization controller and is used for amplifying the power of the first path of optical signal modulated by the second polarization controller to enable the power to reach the threshold value for exciting Brillouin scattering;
the first circulator is connected with the first path of optical signal passing through the optical power amplifier;
the second circulator is connected with the polarization beam splitter; and
and the single-mode optical fiber transmits the first path of optical signal passing through the first optical circulator and the second path of optical signal passing through the second optical circulator in opposite directions in the single-mode optical fiber, so that Brillouin scattering is excited, and a Brillouin scattering signal is finally obtained.
The working wavelengths of the first optical circulator, the second optical circulator and the single-mode optical fiber are the same;
the working wavelengths of the first optical circulator, the second optical circulator and the single-mode optical fiber are 1530-1610 nm, such as 1550 nm.
The single-passband filtering and the double-passband filtering of the reconfigurable filter are realized by adjusting a direct current bias point in an I modulator of the dual-polarization dual-parallel Mach-Zehnder modulator;
the phase modulation of the reconfigurable filter is realized by adjusting a direct current bias point in a Q modulator of the dual-polarization dual-parallel Mach-Zehnder modulator.
The invention also discloses application of the reconfigurable filter in the field of microwave communication.
In an exemplary embodiment of the invention, a reconfigurable filter based on dual-polarization dual-parallel Mach-Zehnder modulators includes a narrow-linewidth laser, two polarization controllers, a dual-polarization dual-parallel Mach-Zehnder modulator, two microwave sources, a polarization beam splitter, a DC source, two optical circulators, an optical power amplifier, a single-mode fiber, and a photodetector. Narrow linewidth lasers provide high quality, low phase noise optical signals. The optical signal passes through the first polarization controller, so that the polarization direction is aligned with one main shaft of the dual-polarization dual-parallel Mach-Zehnder modulator and enters the dual-polarization dual-parallel Mach-Zehnder modulator. The modulator is formed by two double parallel Mach-Zehnder modulators which are arranged in parallel and work in two polarization directions which are perpendicular to each other. The microwave signals provided by the two microwave sources respectively modulate the two double parallel Mach-Zehnder modulators. In addition, one direct current source provides six direct current voltages to carry out bias control on the dual-polarization dual-parallel Mach-Zehnder modulator. The output signal of the modulator is divided into an upper path and a lower path under the action of a polarization beam splitter, and the polarization directions of the two paths are vertical to each other. The first path of signal realizes the rotation of the polarization direction through the polarization controller, so that the polarization directions of the upper path and the lower path are the same, and the power threshold of Brillouin scattering is reached under the action of the optical power amplifier. The signal after power amplification enters the single mode fiber through the first circulator and is transmitted opposite to the second path of optical signal, and Brillouin scattering is excited. And finally, the scattered signal enters the photoelectric detector through the first circulator, and the function of a filter is finally realized. In the invention, the response of the single-passband and dual-passband narrow-band filter can be realized only by adjusting the direct current bias point of the dual-polarization dual-parallel Mach-Zehnder modulator.
In one exemplary embodiment of the invention, a reconfigurable filter based on a dual-polarization dual-parallel mach-zehnder modulator includes:
a narrow linewidth laser for providing a high quality, low phase noise light source having a wavelength of 1530nm to 1610 nm;
the optical input end of the first polarization controller is connected with the output end of the narrow linewidth laser and is used for carrying out polarization control on an optical signal output by the narrow linewidth laser;
a dual-polarization dual-parallel Mach-Zehnder modulator, the input end ports 3-11 of which are connected with the output end of the polarization controller and used for performing electro-optical modulation on optical signals;
two microwave sources (a first microwave source, a second microwave source) for providing microwave signals to the filter system;
two power beam splitters (a first power beam splitter and a second power beam splitter), wherein an input end port 14-1 of the first power beam splitter is connected with an output end of a first microwave source, and an input end port 15-1 of the second power beam splitter is connected with an output end of a second microwave source;
a first output end port 14-2 and a second output end port 14-3 of the first power beam splitter are respectively connected with a first microwave input end port 3-1 and a second microwave input end port 3-2 of the dual-polarization dual-parallel Mach-Zehnder modulator, and a first output end port 15-2 and a second output end port 15-3 of the second power beam splitter are respectively connected with a third microwave input end port 3-2 and a fourth microwave input end port 3-4 of the dual-polarization dual-parallel Mach-Zehnder modulator;
the first to sixth output end ports 11-1, 11-2, 11-3, 11-4, 11-5 and 11-6 of the direct current source are respectively connected with the first to sixth direct current input end ports 3-5, 3-6, 3-7, 3-8, 3-9 and 3-10 of the dual-polarization dual-parallel Mach-Zehnder modulator and used for carrying out direct current bias on the dual-polarization dual-parallel Mach-Zehnder modulator;
the input end 4-1 of the polarization beam splitter is connected with the output ends 3-12 of the dual-polarization dual-parallel Mach-Zehnder modulator and is used for separating two paths of optical signals with mutually vertical polarization directions;
the input end of the second polarization controller is connected with the first output end port 4-2 of the polarization beam splitter and is used for controlling the polarization direction of the optical signal to be the same as that of the other path;
the input end of the optical power amplifier is connected with the output end of the second polarization controller and is used for power amplification so as to enable the optical power amplifier to reach the threshold value of stimulated Brillouin scattering;
the two ends of the single-mode optical fiber are respectively connected with the two optical circulators and used for realizing Brillouin scattering;
two optical circulators (a first optical circulator and a second optical circulator), wherein a first input end port 7-1 of the second optical circulator is connected with a second output end port 4-3 of a polarization beam splitter, a first output end port 7-2 is connected with a port 8-1 end of a single-mode optical fiber, a second input end port 7-3 is also connected with a port 8-1 end of the single-mode optical fiber, a first input end port 9-1 of the first optical circulator is connected with an output end of an optical power amplifier, a port 8-2 end of the single-mode optical fiber of a first output end port 9-2 is connected, a second input end port 9-3 is also connected with a port 8-2 end of the single-mode optical fiber, and a second output end 9-4 is connected with an input end of a photoelectric detector and used for realizing the switching of an optical path;
the input end of the photoelectric detector is connected with the second output end port 9-4 of the first optical circulator and used for realizing photoelectric conversion;
wherein the wavelength of the narrow linewidth laser is 1550nm, and the linewidth is below 100 kHz;
the dual-polarization dual-parallel Mach-Zehnder modulator is an electro-optical modulator of a lithium niobate crystal, the working wavelength of the dual-polarization dual-parallel Mach-Zehnder modulator is 1530 nm-1610 nm, the bandwidth for processing microwave signals is more than or equal to 20GHz, the extinction ratio is more than or equal to 20dB, and the half-wave voltage is more than or equal to 4V;
wherein the splitting ratio of the power splitter (the first power splitter and the second power splitter) is 50:50, the two paths of beam splitting signals have no phase difference, and the working bandwidth is more than or equal to 40 GHz;
the bandwidth of the optical power amplifier is larger than the working bandwidth of the dual-polarization dual-parallel Mach-Zehnder modulator;
wherein the working wavelength of the optical circulators (the first optical circulator and the second optical circulator) is 1550 nm;
wherein the operating wavelength of the single mode optical fiber is around 1550 nm;
wherein, the working frequency range of the photoelectric detector is more than 40 GHz.
Wherein, the optical fiber jumper connecting the dual-polarization dual-parallel Mach-Zehnder modulator and the polarization beam splitter must be polarization-maintaining.
Wherein, the working bandwidth of the microwave sources (the first microwave source and the second microwave source) is more than 40GHz, and the output power is small (the power is less than 22 dBm).
The technical solution of the present invention is further illustrated by the following specific embodiments in conjunction with the accompanying drawings. It should be noted that the following specific examples are given by way of illustration only and the scope of the present invention is not limited thereto.
Referring to fig. 1 to 3, the present invention provides a reconfigurable filter based on dual-polarization dual-parallel mach-zehnder modulator, including:
a narrow linewidth laser 1 for providing a high quality, low phase noise optical carrier signal, the wavelength of the light source being 1550 nm;
a first polarization controller 2, the optical input end of which is connected with the output end of the narrow linewidth laser 1, and is used for controlling the polarization of the optical signal output by the narrow linewidth laser 1, so that the polarization direction of the optical signal is aligned to one main axis direction of the dual-polarization dual-parallel mach-zehnder modulator 3;
a dual-polarization dual-parallel Mach-Zehnder modulator 3, the optical input port 3-11 of which is connected with the output end of the narrow linewidth laser 1 for realizing modulation of optical carrier signals, the modulator 3 is made of lithium niobate crystals;
two microwave sources (a first microwave source 12 and a second microwave source 13) for providing microwave signals to the filter system, wherein the first microwave source 12 is used for simulating input microwave signals, the second microwave source 13 is used for providing pump light required for stimulating Brillouin scattering, in addition, two power beam splitters (a first power beam splitter 14 and a second power beam splitter 15) respectively perform equal-power beam splitting on output signals of the two microwave sources, two beam splitting signals of the first microwave source 12 modulate an I modulator in the dual-polarization dual-parallel Mach-Zehnder modulator 3, and two beam splitting signals of the second microwave source 13 modulate a Q modulator in the dual-polarization dual-parallel Mach-Zehnder modulator 3;
a direct current source 11, six output ends of which are connected with six direct current input ends of a dual-polarization dual-parallel Mach-Zehnder modulator 3, and which performs direct current bias control on the modulator 3, and by not setting different direct current bias points, carrier suppression single-sideband modulation, carrier suppression double-sideband modulation and common phase modulation can be obtained, and single pump light, double pump lights and phase modulation signals are provided for the system;
the modulated optical signals are sent to a second polarization beam splitter 5, signals in different polarization directions are separated, and the signals are respectively a first path of optical signal and a second path of optical signal, wherein an optical fiber jumper wire connecting the dual-polarization dual-parallel Mach-Zehnder modulator and the polarization beam splitter is polarization-maintaining;
the first path of optical signal realizes polarization rotation under the action of the second polarization controller 5, so that the polarization direction of the first path of optical signal is consistent with that of the second path of optical signal, the power of the first path of optical signal reaches the threshold value for exciting Brillouin scattering under the action of the optical power amplifier 6, and the amplified signal enters the single mode fiber 8 under the guidance of the optical path of the first optical circulator 9;
the second path of optical signal also enters the single-mode optical fiber 8 under the guide of the optical path of the second optical circulator 7, and at the moment, the first path of signal and the second path of signal are transmitted in the single-mode optical fiber 8 in opposite directions to stimulate Brillouin scattering, so that the required Brillouin gain and Brillouin loss are obtained, and the amplification and attenuation of a specific sideband are realized; and finally, the scattered signal enters the photoelectric detector through the first optical circulator, and the function of a filter is finally realized.
In order to realize single-passband filtering and double-passband filtering, carrier suppression single-sideband modulation or carrier suppression double-sideband modulation can be realized by adjusting a direct current bias point in an I modulator of the dual-polarization double-parallel Mach-Zehnder modulator 3, one pump light or two pump light signals are respectively provided for a system, and in addition, common phase modulation can be realized by adjusting a direct current bias point in a Q modulator of the dual-polarization double-parallel Mach-Zehnder modulator, and phase modulation signals are provided for the system;
finally, the corresponding filter response curve can be seen by the vector network analyzer.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A reconfigurable filter based on dual-polarization dual-parallel mach-zehnder modulators, comprising:
a narrow linewidth laser for providing a light source;
the first polarization controller is connected with the output end of the narrow linewidth laser and is used for carrying out polarization control on an optical signal output by the narrow linewidth laser so that the polarization direction of the optical signal is aligned to one main shaft direction of the dual-polarization dual-parallel Mach-Zehnder modulator;
a dual-polarization dual-parallel Mach-Zehnder modulator connected with the output end of the first polarization controller for performing electro-optical modulation on the optical signal;
the microwave source unit is connected with the dual-polarization dual-parallel Mach-Zehnder modulator and used for providing microwave signals for the dual-polarization dual-parallel Mach-Zehnder modulator;
a direct current source connected with the dual-polarization dual-parallel Mach-Zehnder modulator for performing bias control on the dual-polarization dual-parallel Mach-Zehnder modulator;
the Brillouin scattering unit is used for realizing opposite transmission of two paths of optical signals modulated by the dual-polarization dual-parallel Mach-Zehnder modulator in a single-mode optical fiber of the Brillouin scattering unit so as to stimulate Brillouin scattering; wherein the Brillouin scattering unit includes:
the polarization beam splitter is used for splitting two paths of optical signals with different polarization directions modulated by the dual-polarization dual-parallel Mach-Zehnder modulator into a first path of optical signal and a second path of optical signal;
the second polarization controller is used for converting the polarization direction of the first path of optical signal into the polarization direction which is the same as that of the second path of optical signal;
the input end of the optical power amplifier is connected with the output end of the second polarization controller and is used for amplifying the power of the first path of optical signal modulated by the second polarization controller to enable the power to reach the threshold value for exciting Brillouin scattering;
the first optical circulator is connected with the first path of optical signal passing through the optical power amplifier;
the second optical circulator is connected with the polarization beam splitter; and
the single-mode optical fiber is used for transmitting a first path of optical signal after passing through the first optical circulator and a second path of optical signal after passing through the second optical circulator in opposite directions in the single-mode optical fiber so as to stimulate Brillouin scattering and finally obtain a Brillouin scattering signal; and
and the photoelectric detector is connected with the Brillouin scattering unit and is used for performing photoelectric conversion on the optical signal subjected to Brillouin scattering so as to realize the function of the reconfigurable filter.
2. The reconfigurable filter of claim 1,
the wavelength of the light source is 1530-1610 nm; the linewidth is less than or equal to 100 kHz.
3. The reconfigurable filter of claim 2,
the wavelength of the light source is 1550 nm.
4. The reconfigurable filter of claim 1,
the connecting optical fiber between the dual-polarization dual-parallel Mach-Zehnder modulator and the polarization beam splitter is a polarization-maintaining optical fiber;
the dual-polarization dual-parallel Mach-Zehnder modulator comprises two dual-parallel Mach-Zehnder modulators which are placed in parallel, and the two dual-parallel Mach-Zehnder modulators work in two mutually perpendicular polarization directions respectively;
the dual-polarization dual-parallel Mach-Zehnder modulator is made of lithium niobate crystals;
the dual-polarization dual-parallel Mach-Zehnder modulator is an electro-optical modulator;
the working wavelength of the dual-polarization dual-parallel Mach-Zehnder modulator is 1530-1610 nm, the bandwidth for processing microwave signals is more than or equal to 20GHz, the extinction ratio is more than or equal to 20dB, and the half-wave voltage is more than or equal to 4V.
5. The reconfigurable filter of claim 1,
the working frequency range of the photoelectric detector is larger than 40 GHz.
6. The reconfigurable filter of claim 1,
the microwave source unit includes:
a first microwave source for simulating an input microwave signal;
the input end of the first power beam splitter is connected with the first microwave source, and the output end of the first power beam splitter is connected with the double parallel Mach-Zehnder modulator and used for splitting the first microwave source;
a second microwave source for providing pump light required to excite brillouin scattering; and
and the input end of the second power beam splitter is connected with the second microwave source, and the output end of the second power beam splitter is connected with the double parallel Mach-Zehnder modulator and is used for splitting the beam of the first microwave source.
7. The reconfigurable filter of claim 6,
the working bandwidth of the first microwave source is more than 40GHz, and the output power is less than 22 dBm;
the working bandwidth of the second microwave source is more than 40GHz, and the output power is less than 22 dBm;
the beam splitting ratio of the first power beam splitter is 50:50, the two paths of beam splitting signals have no phase difference, and the working bandwidth is more than or equal to 40 GHz;
the beam splitting ratio of the second power beam splitter is 50:50, the two paths of beam splitting signals have no phase difference, and the working bandwidth is more than or equal to 40 GHz;
the bandwidth of the optical power amplifier is larger than the working bandwidth of the dual-polarization dual-parallel Mach-Zehnder modulator;
two paths of beam splitting signals of the first microwave source modulate an I modulator in the dual-polarization dual-parallel Mach-Zehnder modulator;
and the two paths of beam splitting signals of the second microwave source modulate a Q modulator in the dual-polarization dual-parallel Mach-Zehnder modulator.
8. The reconfigurable filter of claim 1,
the working wavelengths of the first optical circulator, the second optical circulator and the single-mode optical fiber are the same;
the working wavelengths of the first optical circulator, the second optical circulator and the single-mode optical fiber are 1530-1610 nm.
9. The reconfigurable filter of claim 8,
the working wavelengths of the first optical circulator, the second optical circulator and the single-mode optical fiber are all 1550 nm.
10. The reconfigurable filter of claim 1,
the single-passband filtering and the double-passband filtering of the reconfigurable filter are realized by adjusting a direct current bias point in an I modulator of the dual-polarization double-parallel Mach-Zehnder modulator;
the phase modulation of the reconfigurable filter is realized by adjusting a direct current bias point in a Q modulator of the dual-polarization dual-parallel Mach-Zehnder modulator.
11. Use of a reconfigurable filter according to any of claims 1-10 in the field of microwave communications.
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